| Project/Area Number |
12555160
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
Building structures/materials
|
|---|
| Research Institution | Oita University |
|---|
Principal Investigator |
SATO Yoshiaki Oita University, Architectural Engineering, Professor, 工学部, 教授 (30038111)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ICHIMIYA Kazuo Oita University, Architectural Engineering, Associate Professor, 助教授 (00176306)
OTANI Toshihiro Oita University, Architectural Engineering, Research Associate, 工学部, 助手 (00315318)
KIYOHARA Chizuru Oita University, Architectural Engineering, Research Associate, 工学部, 助手 (00284787)
UEDA Kenji Sato Benec Co., Ltd., Vice Technical Manager, 技術開発室, 副長
TAKEDA Yoshitsugu Nishi-Nippon Institute of Technology, Professor, 工学部, 教授 (70125160)
田口 茂久 全国生コンクリート工業組合連合会, 九州地区本部, 技術部長
永松 清也 大分大学, 工学部, 教授 (70037828)
|
|---|
| Project Period (FY) |
2000 – 2002
|
| Project Status |
Completed (Fiscal Year 2002)
|
| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2002: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
|
|---|
| Keywords | Ready-Mixed Concrete Plant / Concrete Sludge / Integrated Recycling System / Sludge Water / Sludge Cake / Inorganic Coagulant / Pulverized Dry Sludge / Waste Casting Sand / 回収水 |
|---|
| Research Abstract |
The purpose of this study is to discuss an integrated concrete sludge treatment and recycling system that regenerates the concrete sludge discharged from ready-mixed concrete plants into a powdered material of high added value. The following conclusions may be drawn based on the current research project:
(1) The coagulant including more than 95% of inorganic substance for the treatment of concrete sludge was developed, and the test data on the optimum dosage and the stirring time of inorganic coagulant were collected.
(2) Sludge cake obtained by the process of pressurization and dehydration of sludge water was dried, and then crushed finely by forded air to produce the powdered material (Pulverized Dry Sludge, PDS). The data on the manufacturing condition of PDS were collected. It was found that PDS consisted of rounded ultra fine particles having a size of 3-10μm and a Blaine specific surface area of 8,000-10,000 cm^2/g, and was easy to produce.
(3) The experiments on the use of PDS as a
… More
kind of mineral admixture and the powder material for high-fluidity concrete were carried out, and the good test results were obtained. It was confirmed that in the case of a mineral admixture, PDS had no harmful effects on hardened concrete although the dosage had sometimes to be limited to about 10% of the cement content because high content of concrete sludge significantly increased the demand of mixing water, in the case of high-fluidity concrete, the limitation of PDS content was 30 vol.%, according to Regulation JASS5 for high-fluidity concrete although test results showed that high fluidity concrete containing PDS up to 60% of volume content had a good performance.
(4) The application of the complete recycling system developed in this research project to other waste materials other than concrete sludge was discussed. It was found that the ultra fine powder crushing and processing technology will become possible to apply other wastes such as the faulty construction materials, waste glass bottles and casing sand as well as wet wastes such as dirty mud discharged from the quarrying factory and the construction site. Less
|
